Jochen Horst Kurz

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Determining the onset of transient signals like seismograms, acoustic emissions or ultrasound signals is very time consuming if the onset is picked manually. Therefore, different approaches exist, especially in seismology. The concepts of the most popular approaches are summarized. An own approach adapted to ultrasound signals and acoustic emissions, based(More)
Acoustic emission techniques (AET) are an alternative monitoring method to investigate the status of a bridge or some of its components. It has the potential to detect defects in terms of cracks occurring during the routine use of bridges. Due to the attenuation of acoustic waves and geometrical spreading in concrete structures numerous sensors have to be(More)
A combination of different non-destructive test methods is often necessary to receive reliable results for material characterization, flaw detection and the determination of component specific geometry parameters. Concerning concrete structures, thickness measurements combined with flaw detection and additional information about reinforcement and tendon(More)
The integration of non-destructive testing and probabilistic fracture mechanics offers the possibility to gain realistic fracture mechanical assessment results considering nearly all uncertainties of the input values. Therefore, a probabilistic analysis has to be performed using distributions instead of discrete values as input parameters. This concept was(More)
The acoustic emission signal contains information about the fracture process which emits the signal and its travel path to the recording sensor. This is expressed in the signal's shape. Estimating the cross correlation function or the magnitude squared coherence function between several signals of clustered events, leads to information about the similarity(More)
Ultrasonic testing and evaluation procedures typically depend on reference reflectors to establish detection sensitivity and evaluation of test data. Rules and regulations governing safety-related components emphasize on test procedures that assure the detectability of discontinuities at all over the component and oriented in any arbitrary direction.(More)
Reinforced concrete decks e.g. in car park buildings or on bridges are often exposed to deicing salts and weathering. Due to these exposure conditions there is a high risk of chloride induced reinforcement corrosion. To be able to properly maintain such structures the current condition needs to be assessed. Such an evaluation is usually based on the(More)
The task of locating a source in space by measuring travel time differences of elastic or electromagnetic waves from the source to several sensors is evident in varying fields. The new concepts of automatic acoustic emission localization presented in this article are based on developments from geodesy and seismology. A detailed description of source(More)
NDT is an essential part during construction and maintenance of nuclear power plants. In Germany, type and extent of inspection are specified in Safety Standards of the Nuclear Safety Standards Commission (KTA). Only certified inspections are allowed in the nuclear industry. The qualification of NDT is carried out in form of performance demonstrations of(More)
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